The operational amplifier

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Operational Amplifiers
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Presentation transcript:

The operational amplifier A basic building block in many electrical circuits First used to implement mathematical operations (addition, integration, etc.) Also called the op amp

Op amp Eight-lead DIP package

Op amp, cont. Circuit symbol

Op amp, cont. Terminal voltage and currents

Op amp, cont. The output voltage is a function of the input voltage difference Linear region: vo = A (vp - vn) A ≥ 104

Op amp, cont. Idealized operational amplifier A -> ∞ -> vn = vp Input resistance -> ∞ -> in = ip = 0 Note: in + ip + io + i1 + i2 = 0 io = - i1 - i2

Inverting amplifier

Inverting amplifier, cont.

Classwork #2 Find vo

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